The frame in Carbon Monocoque UD. Steering differentiated from 1-1/8" above to 1-1/4" below and prodividing high torsional stiffness. Monolithic carbon fibre dropouts. The smaller seats allow the weight and the frame to be reduced and do not compromise the mechanical properties such as stiffness and fatigue life. After careful and servere simulations, a particular "S" line of seat-stays for this frame has been developed, which can ease vibration levels on the seats and the refore maximise perfomance and comfort. The particular four peaks rear structure provide better stiffness values and more frame fatigue strength.